Add C++ support

Add extern statement. Also fix the strlwr definition on Windows.

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.24)
-project(midi_note_id_utils C)
+project(midi_utils C)
 
 set(CMAKE_C_STANDARD 11)
 

midi-utils.c

@@ -1,6 +1,6 @@
 #include "midi-utils.h"
 
-#if !defined __WIN32
+#if !defined _WIN32
 void _strlwr(char* dest) {
 	for (unsigned int i = 0; i < strlen(dest); i += 1) {
 		if ('A' <= dest[i] && dest[i] <= 'Z') {

midi-utils.h

@@ -11,8 +11,16 @@
 #define MIDI_CC_SOSTENUTO 0x42u
 #define MIDI_CC_UNACORDA 0x43u
 
-char* MIDI_GetNoteName(unsigned char);
+#if defined __cplusplus
+extern "C" {
+#endif
+
+char *MIDI_GetNoteName(unsigned char);
 
-unsigned char MIDI_GetNoteFromName(const char*);
+unsigned char MIDI_GetNoteFromName(const char *);
+
+#if defined __cplusplus
+}
+#endif
 
 #endif